Back up the Truck; Do you know for sure what "rate" your BEGI Gizmo in raising fuel pressure??? Like Rob said it should raise the Fuel Pressure 1 psi per psi of Boost. Some Yo-Hip b.s. "Fuel Pressure Regulator will raise it as much as 11:1. Some are also comnonly known as FMU or secondary Fuel Pressure Regulator. That crap is old school and was never proven to work well with modern ECUs.

E-Manage should be a decent platform to Tune with but might limit you to a certain size Injectors.

All in all; making power out of a 4G63 is very well documented and we tend to use certain "wayz" as they yeild decent, consistent results.

Sell you E-Manage and that "unknown" FPR, use the money for a Peckerhead Chip, a SAFC or DSMLink.

Hope this helps.

Ghislain